@thomasfuchs The last breakups helped MS start, so I'm not sure that breakups work.
If governments want to get involved, they could stick Linux in schools, making it the default for a generation, and make sure their requirements are open.
All school coursework, websites, info on local utilities, et c., could work according to general browser specs, and that could establish those specs as a default.
They might also give some funding to open browser development.